Design systems, built with AI
One design system.
Every platform.
We turn the assets you already have — a brand, a Figma file, a codebase, or all three — into a cross-platform design system, then build and own your front end on web, iOS and Android.
The friction
Your product ships on three platforms. Your design system lives on none of them.
So every team re-types it. Web guesses a hex, iOS invents a spacing value, Android rebuilds a button you already had — and your AI agents do the same thing, faster.
> build the checkout button on iOS
> context available: one screenshot
> fill "#0D8CE8" ← guessed
> radius 10 ← invented
> web match not checked
↑ Three platforms, three translations, three ways to drift. That's the bottleneck.
The handoff isn't a step in the schedule. It's most of the schedule. Multiply it by every platform you ship and every agent writing UI, and the front end becomes the slowest part of the company.
Your assets → one system → three platforms
From what you have to what ships, in six steps.
No rewrite, no new platform to license. We codify what's already there and make it the input to everything that follows.
Brand guidelines, Figma files, an existing codebase — or just a logo. We start from whatever is real.
Colour, type, space, radius, motion — extracted, named and checked for contrast, in one source of truth.
The same tokens emitted as CSS, SwiftUI and Jetpack Compose. Change one value; every platform follows.
Built once per platform against the tokens, documented in a living Storybook your team can browse.
Checks reject hardcoded values, invented components and anything below the accessibility floor — from people or agents.
We build your features on top and keep the system healthy — or hand it to your team with a runbook. Your call.
Works with an existing codebase or from scratch, with or without a design system, on any Figma plan or none. Everything lands in your repository.
The demo
Watch a generated PR fail a design-system check.
Same pull request, two pipelines. Without a shared system, nothing is looking. With one, drift never reaches a human — on any platform.
You shouldn't have to catch a hardcoded value in code review — three times. The rules become checks every platform has to pass.
What changes
Three translations, to one source of truth.
Design stops sending requests to three engineering teams and starts shipping capability — tokens and components every platform already uses.
Before
- Designers specify.
- Web, iOS and Android each interpret.
- Designers review three builds.
- Three teams fix.
- Everyone repeats.
After
- Designers define the system once.
- Every platform consumes the same tokens.
- Engineers and agents build against it.
- CI verifies the rules everywhere.
The goal isn't fewer people. It's more product from the people you have — design QA becomes exception handling, and your engineers spend their time on features instead of re-typing values.
Qualification
We'd rather lose the deal than take the wrong one.
FeatureKit fits product companies that ship — or need to ship — on more than one platform, and want one accountable owner for the front end. You might have a mature codebase and no design system, a design system nobody follows, or a brand and a deadline. We'll tell you on the first call whether we're the right shape.
Don't hire us if —
- You only ship one simple surface and it already looks right everywhere.
- You want a one-off visual refresh, not a system that keeps working.
- Nobody on your side can make design decisions in days, not months.
- You need us to own your back end. We own the front end and its contracts.
- You want to keep the code private from yourselves. Everything we build lives in your repo, under your licence.
- You're hoping this cuts design or engineering headcount. It adds capacity; framing it as replacement guarantees non-adoption.
Published price
Four rungs. The first is free.
Brand preview
runs in your browser · uploads nothing
- Drop in a logo or screenshot
- See your brand as tokens, with contrast checked
- Get the CSS, SwiftUI and Compose output
Audit
one week
- Design ↔ code audit across your platforms
- Token and component inventory
- Drift report, ranked by cost
- Written plan and go / no-go
- Credited in full against a build
System
four weeks
- Everything in Audit
- One token layer, three platforms
- Core components on web, iOS and Android
- Storybook and docs
- CI drift and contrast checks
- One feature shipped to production
Front end, owned
per month
- Everything in System
- We build your features on every platform
- System upkeep as your product grows
- Agent-ready docs and rules
- Weekly releases, your repo
- Hand-off to your team, any time
If the System engagement doesn't ship a feature to production, the fee is refunded, less the audit. Everything lands in your repository under your licence. No platform fee, no seats.
What we can actually show you
Don't trust us. Inspect us.
We're a new practice, so the first case study is the one you're looking at: this site, its design system and its Storybook are public.
Switch the brand in the theme panel and watch the whole page follow. Nine brands, one token layer. Open the Storybook, read the tokens, try the brand preview on your own logo. Every one of those you can verify without talking to us.
Senior people. No bench. Blair Metcalf leads design and engineering — twenty-five years across both, currently Staff UX Engineer at Reddit, earlier design tooling at Google Cloud and UI for Halo 4. The people on this page are the people in your repo.
Four measures, baselined in week one and re-measured at ninety days: days from design-complete to shipped on every platform · design-QA defects per feature · share of UI code using sanctioned tokens and components · drift the automated checks caught before review.
The whole company in five words
One system, every platform.
Fix the input once and everything downstream gets easier — web, iOS, Android, and every agent writing code for them.
Preview your brand
Drop in a logo or screenshot. It runs in your browser and uploads nothing. See your brand as a design system on three platforms in under a minute.
Try it nowAsk if we're a fit
Tell us your platforms, whether you have a codebase and a design system, and your timeline. We'll tell you honestly whether we're the right shape.
Ask about fitBook a call
Walk us through your product. Leave with a rough plan, an estimate and a straight answer — whether or not you hire us.
Book a callYou don't need to have convinced anyone internally yet. hello@design-systems.ai